If you haven't just been playing with CP300 templates to check out weapon ultimates, duel, theorycraft armor sets, etc., and have made a new low level character you might have noticed that extra bit of bolstering that level 1- level 33 players get.
At level 1 i the tutorial you start out with a whoping extra 97% damage against monsters in addition to all the other bolstering and a bit of extra health. Each level you lose 3% of that additional bolster so by level 10 it's down to + 70% extra damage and so on until it goes down to 0 at level 34.
Of course when you level up if you use your skill points wisely on morphs, passives, etc. and add to your damage dealing stat (magicka or stamina) you more than make up for that 3% you lose. You do still have a feeling of progression and steadily becoming more capable as you level.
I don't know how much internal testing you did on this but that 3% per level thing you settled on feels bang on.
It's a great way to hold the newbie's hands while they get their bearings while slightly buffing the mob difficulty for the rest of us.
Kudos on this.